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Acceleration of gravity for a ball thrown upward and downward

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Assume that the acceleration of gravity is 10 m/s2 downward, and
that all friction effects can be neglected. A ball is thrown upward
at a velocity of 20 m/s. What is its velocity at t = 2 s?
zero

a. 10 m/s upward
b. 10 m/s downward
c. 20 m/s downward
d. 20 m/s upward

Assume that the acceleration of gravity is 10 m/s2 downward, and
that all friction effects can be neglected. A ball is thrown upward
at a velocity of 20 m/s. What is its velocity at t = 3 s?
zero

a. m/s upward
b. 10 m/s downward
c. 20 m/s downward
d. 20 m/s upward

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Vf = Vi + at

Vf = final velocity
Vi = initial velocity
a = ...

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